<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' :'200px'">
          <div class="toggle-button" @click="toggleCollpase">|||</div>
          <!-- 侧边栏菜单区域 -->
        <el-menu
          background-color="#82c0d3"
          active-text-color="#7ee6f8"
          text-color="#fff"
          unique-opened
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"        
          :default-active="activePath"
        >
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>
            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/'+subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState(subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 右侧内容主体 -->
      <el-main class="main">
          <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data() {
    return {
      menulist: [],
      iconsObj: {
        125: 'el-icon-s-custom',
        103: 'el-icon-files',
        101: 'el-icon-s-goods',
        102: 'el-icon-s-order',
        145: 'el-icon-s-marketing',
      },
      isCollapse:false,  //菜单是否折叠
      activePath:'',    //被激活的链接地址
    }
  },
  created() {
    this.getMenuList()
    this.activePath='/'+window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear() //清空token
      this.$router.push('/login') //重定向到登录页面
    },
    // 获取所有菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      console.log(res)
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollpase(){
        this.isCollapse=!this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath);
        this.activePath='/'+activePath;
    }
  },
}
</script>

<style lang='less' scoped>
.home-container {
  width: 100%;
  height: 100%;
}
.el-header {
  background-color: rgb(89, 167, 180);
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #82c0d3;
  .el-menu{
      border-right: none;
  }
}
.el-main {
  background-color: rgb(210, 242, 247);
}
.toggle-button{
    background-color: rgb(206, 231, 233);
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;  //字之间间距
    cursor: pointer;
}
</style>